William Richard "Billy" West (born April 16, 1950) is an American voice actor, singer, comedian, musician and former radio personality who is best known for his voice-work on The Ren & Stimpy Show, Doug and Futurama, voicing multiple main characters on all three shows.

On Ren & Stimpy, he was originally only the voice of Stimpy J. Cat. When series creator John Kricfalusi, who voiced Ren Höek, was fired after various disputes with the network, West took over the role of Ren and Mr. Horse for the remainder of the Nickelodeon run. From the same series, West would voice the Gilded Yak in the video game Nicktoons MLB, released in 2011. Coincidentally, his successor as Stimpy, Eric Bauza, who voiced the character for Ren & Stimpy: "Adult Party Cartoon", reprised the role for the same video game. (It is unknown why West did not voice Stimpy or Ren in that game.)

On Doug, he most prominently voiced the main character Doug Funnie and the bully Roger Klotz. He refused to reprise the roles when the series was revived by Disney.